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// SPDX-License-Identifier: GPL-2.0-or-later
/** @file
* TODO: insert short description here
*//*
* Authors: see git history
*
* Copyright (C) 2018 Authors
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <glibmm/i18n.h>
#include "context-fns.h"
#include "desktop.h"
#include "layer-manager.h"
#include "message-context.h"
#include "message-stack.h"
#include "snap.h"
#include "display/control/snap-indicator.h"
#include "object/sp-namedview.h"
#include "object/sp-item-group.h"
#include "ui/modifiers.h"
#include "ui/tools/tool-base.h"
static const double midpt_1_goldenratio = (1 + goldenratio) / 2;
static const double midpt_goldenratio_2 = (goldenratio + 2) / 2;
/* FIXME: could probably use a template here */
/**
* Check to see if the current layer is both unhidden and unlocked. If not,
* set a message about it on the given context.
*
* \param desktop Desktop.
* \param message Message context to put messages on.
* \return true if the current layer is both unhidden and unlocked, otherwise false.
*/
bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageContext *message)
{
auto layer = desktop->layerManager().currentLayer();
if ( !layer || desktop->itemIsHidden(layer) ) {
message->flash(Inkscape::ERROR_MESSAGE,
_("<b>Current layer is hidden</b>. Unhide it to be able to draw on it."));
return false;
}
if ( layer->isLocked() ) {
message->flash(Inkscape::ERROR_MESSAGE,
_("<b>Current layer is locked</b>. Unlock it to be able to draw on it."));
return false;
}
return true;
}
/**
* Check to see if the current layer is both unhidden and unlocked. If not,
* set a message about it on the given context.
*
* \param desktop Desktop.
* \param message Message context to put messages on.
* \return true if the current layer is both unhidden and unlocked, otherwise false.
*/
bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageStack *message)
{
auto layer = desktop->layerManager().currentLayer();
if ( !layer || desktop->itemIsHidden(layer) ) {
message->flash(Inkscape::WARNING_MESSAGE,
_("<b>Current layer is hidden</b>. Unhide it to be able to draw on it."));
return false;
}
if ( layer->isLocked() ) {
message->flash(Inkscape::WARNING_MESSAGE,
_("<b>Current layer is locked</b>. Unlock it to be able to draw on it."));
return false;
}
return true;
}
Geom::Rect Inkscape::snap_rectangular_box(SPDesktop const *desktop, SPItem *item,
Geom::Point const &pt, Geom::Point const ¢er, int state)
{
desktop->snapindicator->remove_snaptarget();
Geom::Point p[2];
auto confine = Modifiers::Modifier::get(Modifiers::Type::TRANS_CONFINE)->active(state);
auto off_center = Modifiers::Modifier::get(Modifiers::Type::TRANS_OFF_CENTER)->active(state);
SnapManager &m = desktop->namedview->snap_manager;
m.setup(desktop, false, item);
Inkscape::SnappedPoint snappoint;
if (confine) {
/* We are constrained to producing integer-ratio rectangles */
/* Vector from the centre of the box to the point we are dragging to */
Geom::Point delta = pt - center;
/* Round it so that we have an integer-ratio (or golden ratio) box */
if (fabs(delta[Geom::X]) > fabs(delta[Geom::Y]) && (delta[Geom::Y] != 0.0)) {
double ratio = delta[Geom::X] / delta[Geom::Y];
double ratioabs = fabs (ratio);
double sign = (ratio < 0 ? -1 : 1);
if (midpt_1_goldenratio < ratioabs && ratioabs < midpt_goldenratio_2) {
delta[Geom::X] = sign * goldenratio * delta[Geom::Y];
} else {
delta[Geom::X] = floor(ratio + 0.5) * delta[Geom::Y];
}
} else if (delta[Geom::X] != 0.0) {
double ratio = delta[Geom::Y] / delta[Geom::X];
double ratioabs = fabs (ratio);
double sign = (ratio < 0 ? -1 : 1);
if (midpt_1_goldenratio < ratioabs && ratioabs < midpt_goldenratio_2) {
delta[Geom::Y] = sign * goldenratio * delta[Geom::X];
} else {
delta[Geom::Y] = floor(delta[Geom::Y] / delta[Geom::X] + 0.5) * delta[Geom::X];
}
}
/* p[1] is the dragged point with the integer-ratio constraint */
p[1] = center + delta;
if (off_center) {
// Our origin is the centre point rather than the corner point;
// this means that corner-point movements are bound to each other.
/* p[0] is the opposite corner of our box */
p[0] = center - delta;
Inkscape::SnappedPoint s[2];
/* Try to snap p[0] (the opposite corner) along the constraint vector */
s[0] = m.constrainedSnap(Inkscape::SnapCandidatePoint(p[0], Inkscape::SNAPSOURCE_NODE_HANDLE),
Inkscape::Snapper::SnapConstraint(p[0] - p[1]));
/* Try to snap p[1] (the dragged corner) along the constraint vector */
s[1] = m.constrainedSnap(Inkscape::SnapCandidatePoint(p[1], Inkscape::SNAPSOURCE_NODE_HANDLE),
Inkscape::Snapper::SnapConstraint(p[1] - p[0]));
/* Choose the best snap and update points accordingly */
if (s[0].getSnapDistance() < s[1].getSnapDistance()) {
if (s[0].getSnapped()) {
p[0] = s[0].getPoint();
p[1] = 2 * center - s[0].getPoint();
snappoint = s[0];
}
} else {
if (s[1].getSnapped()) {
p[0] = 2 * center - s[1].getPoint();
p[1] = s[1].getPoint();
snappoint = s[1];
}
}
} else {
/* Our origin is the opposite corner. Snap the drag point along the constraint vector */
p[0] = center;
snappoint = m.constrainedSnap(Inkscape::SnapCandidatePoint(p[1], Inkscape::SNAPSOURCE_NODE_HANDLE),
Inkscape::Snapper::SnapConstraint(p[1] - p[0]));
if (snappoint.getSnapped()) {
p[1] = snappoint.getPoint();
}
}
} else if (off_center) {
// Our origin is the centre point rather than the corner point;
// this means that corner-point movements are bound to each other.
p[1] = pt;
p[0] = 2 * center - p[1];
Inkscape::SnappedPoint s[2];
s[0] = m.freeSnap(Inkscape::SnapCandidatePoint(p[0], Inkscape::SNAPSOURCE_NODE_HANDLE));
s[1] = m.freeSnap(Inkscape::SnapCandidatePoint(p[1], Inkscape::SNAPSOURCE_NODE_HANDLE));
if (s[0].getSnapDistance() < s[1].getSnapDistance()) {
if (s[0].getSnapped()) {
p[0] = s[0].getPoint();
p[1] = 2 * center - s[0].getPoint();
snappoint = s[0];
}
} else {
if (s[1].getSnapped()) {
p[0] = 2 * center - s[1].getPoint();
p[1] = s[1].getPoint();
snappoint = s[1];
}
}
} else {
/* There's no constraint on the corner point, so just snap it to anything */
p[0] = center;
p[1] = pt;
snappoint = m.freeSnap(Inkscape::SnapCandidatePoint(pt, Inkscape::SNAPSOURCE_NODE_HANDLE));
if (snappoint.getSnapped()) {
p[1] = snappoint.getPoint();
}
}
if (snappoint.getSnapped()) {
desktop->snapindicator->set_new_snaptarget(snappoint);
}
p[0] *= desktop->dt2doc();
p[1] *= desktop->dt2doc();
m.unSetup();
return Geom::Rect(Geom::Point(MIN(p[0][Geom::X], p[1][Geom::X]), MIN(p[0][Geom::Y], p[1][Geom::Y])),
Geom::Point(MAX(p[0][Geom::X], p[1][Geom::X]), MAX(p[0][Geom::Y], p[1][Geom::Y])));
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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